本文選題：平直巷道　切入點：膠帶火災(zāi)　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：膠帶火災(zāi)是煤礦井下常見的一種外因火災(zāi),膠帶巷中可燃物多,一旦發(fā)生膠帶燃燒,火勢會迅速發(fā)展,形成典型的巷道火災(zāi)。礦井膠帶火災(zāi)產(chǎn)生的煙氣隨風(fēng)流蔓延,在狹長的巷道空間中形成一種高溫毒害的環(huán)境,危害井下礦工的健康甚至生命。因此,研究礦井膠帶火災(zāi)煙氣蔓延規(guī)律以及蔓延危險區(qū)域范圍是很有必要的。本文通過分析膠帶火災(zāi)發(fā)展過程中煙氣溫度場和煙氣濃度場的變化規(guī)律,對巷道空間進(jìn)行危險區(qū)域劃分。主要內(nèi)容和結(jié)論:通過歸納和總結(jié),分析膠帶燃燒特性和膠帶火災(zāi)發(fā)生的原因,根據(jù)受限空間火災(zāi)的發(fā)展過程,將膠帶火災(zāi)發(fā)展過程分為初起階段、發(fā)展階段、猛烈階段、衰減和熄滅階段。并將初起階段和發(fā)展階段作為研究的重點。在5種風(fēng)速條件下,用平直巷道火災(zāi)實驗平臺進(jìn)行膠帶燃燒實驗,發(fā)現(xiàn):巷道通風(fēng)速率為0.4m/s時,膠帶燃燒的質(zhì)量損失速率最大。在膠帶燃燒速率最佳的實驗風(fēng)速條件下,模擬膠帶火災(zāi)初起階段煙氣蔓延情況,研究膠帶火災(zāi)初起階段巷道中溫度場以及CO和CO_2氣體濃度隨時間和空間位置的變化規(guī)律。同時,基于Fluent數(shù)值模擬軟件,以平直巷道膠帶燃燒實驗為原型,設(shè)計膠帶火災(zāi)發(fā)展階段的火災(zāi)模型,模擬膠帶火災(zāi)發(fā)展階段巷道中的煙氣流動,掌握了膠帶火災(zāi)發(fā)展階段巷道中溫度場和氣體濃度場隨時間和空間位置的變化規(guī)律。以巷道中高溫有毒煙氣為評價對象,建立了煙氣高溫和毒害評價指標(biāo),對膠帶火災(zāi)初起階段和發(fā)展階段煙氣蔓延區(qū)域進(jìn)行危險性劃分。綜合毒害和高溫區(qū)域的劃分結(jié)果發(fā)現(xiàn):在初起階段,巷道整體為安全區(qū)域,火源附近為亞安全區(qū)域;在發(fā)展階段,巷道空間分為安全區(qū)域、亞安全區(qū)域、中度危險區(qū)域和危險區(qū)域,且各區(qū)域的范圍隨著火災(zāi)發(fā)展時間不斷的變化,此外,相比于高溫劃分的非安全區(qū)域,毒害劃分的非安全區(qū)域范圍更大、危險程度更高,其安全區(qū)域范圍的縮小速率為0.13～0.38m/s,危險區(qū)域范圍增大速率為 0.04～0.32m/s。
[Abstract]:Belt fire is a common external fire in coal mine. Once the belt burning occurs, the fire will develop rapidly and form a typical tunnel fire. The smoke produced by the belt fire spreads with the air flow. In the long and narrow tunnel space, a high temperature toxic environment is formed, which endangers the health and even the life of the underground miners. It is necessary to study the spread law of smoke and the range of dangerous area in mine belt fire. This paper analyzes the variation law of flue gas temperature field and smoke concentration field during the development of belt fire. The main contents and conclusions are as follows: through induction and summary, the characteristics of belt burning and the causes of belt fire are analyzed, and according to the development process of restricted space fire, The development process of belt fire is divided into initial stage, development stage, violent stage, attenuation stage and extinction stage. Using the flat roadway fire experiment platform, it is found that when the ventilation rate of roadway is 0.4 m / s, the mass loss rate of belt burning is the greatest. In order to simulate the flue gas spread in the initial stage of belt fire, the temperature field and the variation law of CO and CO_2 gas concentration with time and space were studied. At the same time, the numerical simulation software Fluent was used to simulate the temperature field and the concentration of CO and CO_2 gas in the roadway during the initial stage of belt fire. Based on the belt burning experiment of straight roadway, the fire model of belt fire development stage is designed, and the smoke flow in roadway is simulated in the development stage of belt fire. The variation law of temperature field and gas concentration field with time and space in roadway during the developing stage of belt fire were mastered. The evaluation index of high temperature and poison of flue gas in roadway was established by taking high temperature toxic flue gas in roadway as the evaluation object. In the first stage of belt fire, the risk of smoke spread is divided between the initial stage and the developing stage. The results of the comprehensive division of toxic and high temperature areas show that, in the initial stage, the roadway as a whole is a safe area, and the fire source is a sub-safe area near the source of fire; In the development stage, the roadway space is divided into the safe area, the sub-safe area, the moderate dangerous area and the dangerous area, and the range of each area changes with the fire development time, in addition, compared with the non-safe area of high temperature, The range of non-safety area divided by poison is larger and the degree of danger is higher. The reduction rate of safety zone is 0.13m / s, and the increase rate of dangerous area is 0.04n0.32m/ s.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD752

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